"Boudinage results from the elongation or stretching of a relatively competent bed between incompetent beds, but two distinct types can be defined. These are (1) extension produced on the limbs of folds during folding (with boudin axes in b) and (2) extension normal to the direction of pressure, when extension may be either (a) in the strike direction with the long axes of boudins lying in the dip direction, or (b) in the plane containing the dip direction with boudin axes similar to (1). Studies in west Cork show that the Coomhola series was subjected to at least two main phases of deformation separated by a phase of emplacement of minor intrusions. Deformation of the intrusions shows that boudinage development occurred during a late stage of cleavage folding. It is predominantly of type 2a (with distension in the strike direction) with a subordinate development of type 2b."

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